Ripl allows uploading a custom logo for each of your brands. If you choose not to upload at that time, you can update your logo anytime by selecting your "Brand settings" tab under "My posts" on the mobile app OR under "My brand" on the web app. You can also update your logo on a post-by-post basis by tapping the logo on the "Customize" screen.
Under "Brand settings" and "My brand," there is also a toggle switch to display or hide your logo in your posts. If you opt to include your custom logo, you can still hide it on an individual post by clicking your logo in that post and following the prompts to hide your logo for that post.